Bihar is India's poorest state, with an annual per capita income of $111, lower than in the most impoverished countries of the world.
(A) lower than in
(B) lower than that of
(C) and lower than that of
(D) which is lower than in
(E) which is lower than it is in

OA B
I got the ocrrect OA. but I thought the correct answer needs to start with "which"
Some thing like "which is lower than that of".. hence it could correctly modify 111$

It looks like "lower than that of" is missing a preposition. PLease can someone explain